Degradation of the first frequency of an RC frame with damage levels
Damage in RC structures causes the degradation of stiffness and frequency. In this study, the relationship between the two coefficients and damage severities is numerically investigated considering a three-dimensional (3D) RC frame in which the concrete damage plasticity model (CDPM) and the elastop...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2023-04-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/3960/3782 |
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| author | Quy Thue Nguyen Ramazan Livaoglu |
| author_facet | Quy Thue Nguyen Ramazan Livaoglu |
| author_sort | Quy Thue Nguyen |
| collection | DOAJ |
| description | Damage in RC structures causes the degradation of stiffness and frequency. In this study, the relationship between the two coefficients and damage severities is numerically investigated considering a three-dimensional (3D) RC frame in which the concrete damage plasticity model (CDPM) and the elastoplastic model are selected for concrete and reinforcements, respectively. Crack propagation is obtained utilizing a nonlinear static pushover analysis (NSPA). After pushing, according to the base shear force versus top displacement curve, the bending stiffness of the structure is determined rapidly based on the first derivative of the relationship. Thereafter, the degradation of the first frequency is obtained based on the derivative of the nonlinear curve of stiffness, the second derivative of the force- displacement curve viz. As a result, it is observed that the degradation of the first frequency of the RC frame is proportional to the severity of damage but not linearly. More significant damage, a more profound decrease in the frequency. Particularly, the frequency of the frame reduces gradually until the base shear force reaches 70% of the ultimate value at which the parameter is 60% of the healthy counterpart. After that, the reduction gets more significant when the bending capacity approaches the ultimate value. |
| format | Article |
| id | doaj-art-3a73e4c0a3364336a4fcee54e67b721b |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2023-04-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-3a73e4c0a3364336a4fcee54e67b721b2025-01-02T23:00:58ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932023-04-01176411010.3221/IGF-ESIS.64.0110.3221/IGF-ESIS.64.01Degradation of the first frequency of an RC frame with damage levelsQuy Thue NguyenRamazan LivaogluDamage in RC structures causes the degradation of stiffness and frequency. In this study, the relationship between the two coefficients and damage severities is numerically investigated considering a three-dimensional (3D) RC frame in which the concrete damage plasticity model (CDPM) and the elastoplastic model are selected for concrete and reinforcements, respectively. Crack propagation is obtained utilizing a nonlinear static pushover analysis (NSPA). After pushing, according to the base shear force versus top displacement curve, the bending stiffness of the structure is determined rapidly based on the first derivative of the relationship. Thereafter, the degradation of the first frequency is obtained based on the derivative of the nonlinear curve of stiffness, the second derivative of the force- displacement curve viz. As a result, it is observed that the degradation of the first frequency of the RC frame is proportional to the severity of damage but not linearly. More significant damage, a more profound decrease in the frequency. Particularly, the frequency of the frame reduces gradually until the base shear force reaches 70% of the ultimate value at which the parameter is 60% of the healthy counterpart. After that, the reduction gets more significant when the bending capacity approaches the ultimate value.https://www.fracturae.com/index.php/fis/article/view/3960/3782structural integritystructural health monitoringnatural frequencyconcrete damage plasticity modelpushover analysis |
| spellingShingle | Quy Thue Nguyen Ramazan Livaoglu Degradation of the first frequency of an RC frame with damage levels Fracture and Structural Integrity structural integrity structural health monitoring natural frequency concrete damage plasticity model pushover analysis |
| title | Degradation of the first frequency of an RC frame with damage levels |
| title_full | Degradation of the first frequency of an RC frame with damage levels |
| title_fullStr | Degradation of the first frequency of an RC frame with damage levels |
| title_full_unstemmed | Degradation of the first frequency of an RC frame with damage levels |
| title_short | Degradation of the first frequency of an RC frame with damage levels |
| title_sort | degradation of the first frequency of an rc frame with damage levels |
| topic | structural integrity structural health monitoring natural frequency concrete damage plasticity model pushover analysis |
| url | https://www.fracturae.com/index.php/fis/article/view/3960/3782 |
| work_keys_str_mv | AT quythuenguyen degradationofthefirstfrequencyofanrcframewithdamagelevels AT ramazanlivaoglu degradationofthefirstfrequencyofanrcframewithdamagelevels |